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<!DOCTYPE html>
<html>
<head>
<title>CSS Reftest Reference</title>
<link rel="author" title="Aryeh Gregor" href="mailto:ayg@aryeh.name">
<style>
span::before {
display: block;
content: 'abc';
}
</style>
</head>
<body>
<span>def</span>
</body>
</html>